WATER HEATER AND ABNORMALITY INDICATION METHOD IN WATER HEATER

摘要

PROBLEM TO BE SOLVED: To suitably detect jamming of a water circuit through which water circulates while reducing costs by sequentially coupling a heater to heat water and a tank to store heated water.SOLUTION: A hot water system 100 determines that jamming occurs on a second water circuit 28 when an elevated temperature per unit time in water stored in a tank 26 during heating of the water stored in the tank 26 is a first threshold value or less and the temperature of the water stored in the tank 26 is lower than a target boiling temperature by a second threshold value or more.